scsosna99 commented on issue #597: CXF-8149 Reduce synchronization in AbstractJXBProvider URL: https://github.com/apache/cxf/pull/597#issuecomment-553415102 > @scsosna99 could you recheck the case using this impl? Our biggest contention appears to be in getCollectionContext(), where manipulating the collection blocks continually. The solution that we've come up with is to use a ConcurrentHashMap and call putIfAbsent, which substantially reduces blockage I wanted to find a solution that kept this a Set - and had a better chance of passing your scrutiny - but blocking continues, synchronizing threads, impacting performance. I thought using newKeySet() would get me what I needed but didn't; also tried ReentrantReadWriteLock to allow n-read/1-write. Your changes would affect other collections which aren't really impacting me, though I thought changing them to ConcurrentHashMap's would help reduce synchronization. Chances are that all these changes give some general improvement but our hack works better. Our one-off change is 2.6.11 running against Java7 (don't chastise me, I just started here!) so the JDK bug referenced above would need more research. Longer-term goal is moving our services out of the monolith which will end up being Spring Boot and new problems arise.... Thanks all, but I'm going to drop this for now.
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